Creating another image instead of using the existing one

Hello,

I'm using filefield and image cache to upload images to nodes. There are 2 different presets, one for teasers and the other for full view.

Everything works great until I decide to upload an image that was uploaded before. For example, there is a node called "Image cache" and image "example.jpg" attached to it. When I choose to attach example.jpg to article "Drupal images", "example-0.jpg" is created.

Is there a way to upload images that already exist on server without changing the names?

Thank you in advance!